/Engine/Plugins/Experimental/AppleVision/Source/AppleVision/Public/AppleVisionTypes.h
Features of a face that can be detected
enum EDetectedFaceFeatureType { Unkown, FaceContour, InnerLips, LeftEye, LeftEyebrow, LeftPupil, MedianLine, Nose, NoseCrest, OuterLips, RightEye, RightEyebrow, RightPupil, }